DevTools: Initial implementation of line-level CPU profile.

third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js

Index: third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
diff --git a/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js b/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
index 8b6730246bfd24ec7e530708cf48f232c02e88e4..a0396a062f524bcedb3ae7f5d4c3bd4f8a24152c 100644
--- a/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
+++ b/third_party/WebKit/Source/devtools/front_end/source_frame/CodeMirrorTextEditor.js
@@ -1118,6 +1118,30 @@ WebInspector.CodeMirrorTextEditor.prototype = {
 
     /**
      * @param {number} lineNumber
+     * @param {!Element} element
+     */
+    addLineMarker: function(lineNumber, element)

[pfeldman, 2016/03/02 19:48:59]

You don't need this.

[alph, 2016/03/03 02:02:52]

I need a plumbing from UISourceCodeFrame to CM.

+    {
+        if (!this._hasMarkers) {
+            this._codeMirror.refresh();
+            this._codeMirror.setOption("gutters", ["CodeMirror-linenumbers", "CodeMirror-linemarkers"]);
+            this._hasMarkers = true;
+        }
+        this._codeMirror.setGutterMarker(lineNumber, "CodeMirror-linemarkers", element);
+    },
+
+    removeAllLineMarkers: function()

[pfeldman, 2016/03/02 19:48:59]

ditto. it'll become one of the decorators. you can define base decorators in the
UISourceCodeFrame.

[alph, 2016/03/03 02:02:52]

ditto

+    {
+        if (!this._hasMarkers)
+            return;
+        this._hasMarkers = false;
+        this._codeMirror.clearGutter("CodeMirror-linemarkers");
+        this._codeMirror.setOption("gutters", ["CodeMirror-linenumbers"]);
+        this._codeMirror.refresh();
+    },
+
+    /**
+     * @param {number} lineNumber
      * @param {number} columnNumber
      */
     setExecutionLocation: function(lineNumber, columnNumber)